Camera shutter



- M. R. HUTCHISON. JR 2.199.998

CAMERA SHUTTER Filed Oct. 26. 1938 2 Shoots-Sheet l INVENTOR ATTORNEYSM. R. HUTCHISON. JR 2. 9.998

CAMERA SHUTTER Filed Oct. 26, 1938 2 Sheets-Sheet 2 7/ //er/Q huzc/u'sonJ/t INVENTOR BY M Patented May 7, 1940 2.1mm 4 CAMERA sno'rm Miller B.Hutchison, In,

or to Eastman Kodak N. Y., a corporation of New Application October 26,1938, No.

v '7 Claims. This invention particularly to shutters for cameras.

object or my in which the provide a shutter in which the shutter bladeis moved by hypocyclic gearing.

Coming now to the drawings, wherein like reference characters denotelike parts throughout.

Fig. 1 shows a front elevation 01' a shutter constructed in accordancewith and embodying a preferred form of my invention;

Fig. 2 is a. plan view of the shutter shown in Fig. 1 but with theshutter cover removed, showing the shutter parts in a position in whichan exposure is about to be made;

Fig. 3 is a similar view showing the shutter blade approximately halfopen;

Fig. 4 is a similar view with the shutter blade in a wide open positionin which position the blade may be held by a bulb lever;

Fig. 5 is a similar view but with the parts in the position they assumeafter an exposure has been completed and before the trigger has beenreleased;

Fig. 6 is a view showing the parts in the positionwhich they assume asthe trigger is being released, and

Fig. '7 is a similar view but with the shutter parts returned to theirnormal position of rest so that the shutter is again ready for a secondexposure.

It has been diflicult to construct inexpensive camera shutters "of a fewsimple parts and to provide for a comparatively slow exposure.

usually adds to the cost In order to overcome this difliculty, I haveprovided a shutter in which the shutter blade Rochester, N. Y., assign-Company, Rochester,

Jersey is moved through hypocycloidal' gearing which is 01' such naturthat it can be inexpensively punched out 01' sheet material and which atthe same time produces a satisfactory slow exposure without increasingthe dimculty 01' operating the shutter due to relatively heavy -natedbroadly as I with a shutter cover 2 supporting an annular member 3 inwhich there is a central exposure aperture 4-. A trigger I is mounted onthe top of the camera and is to be moved in the direction shown by thearrow lines at I, stantaneous exposure. in the direction shown parts maybe placed, this flange including a slot II through which the shuttertrigger i may pass.

returning to this position as The trigger 5 includes an the' cover blindone end of a has a central aperture 2i closely engaged and free to moveon the upstanding flange 22 of the shutter casing Ill.

The oscillatable member 20 includes a stud 23 which supports the shutterblade 24 and a gear segment 25 fixedly attached to the shutter blade asby spot welding. Gear segment 25 is adapted to mesh with a gear segment28 which is carried by an annular member 21. Thus, when the oscillatablemember 20 is moved by the spring I 1 through actuation of the trigger 5,as soon as the studs l6 and I! pass a dead center as indicated'in Fig.2, the tension of the spring will rapidly oscillate the oscillatablemember 20 engages the shoulder elahown'inl lgasandiandwiliswinltheshutter stud. 23, ll so that the the pivot 24 as this pivot is turned ina clockwise directio causing the -symmetrical ends I4-o and 24-!) o! theshutter blade to open and close the exposure aperture 4.

This movement occurs by tensloning the "hairspring i'l through movementoi the shutter trigger l in a counterclockwise position from theposition shown tion shown in Fig. 6. a

In order to limit the movement or the oscillatable member, the annularmember 21 is provided with a cut-out 2| having shoulders 30 and II,against which the rounded end 42 of the arm II is adapted to come torest. The arm is I. when the parts are in as indicated in the shoulder3| indicated position to start an exposure Fig. 2 and the arm I! engagesat the completion of an exposure as in Fig. 5.

The recess portion 20 is preierabLv notched as indicated at l! for thereception of the time stop lever 84 pivoted upon the shaft '5 andoperable by the time lever B as above described. Thus, this lever maymove from the ,position lying in the notch as; indicated in Fig. 3, inwhich position it permits the arm is to swing ireely through its path toits operative position shown in Fig. 4, in which the upstanding flangeII will engage the oscillatable member 20 through trigger turns the itsarm I. when the shutter blade 24 has completely uncovered the exposureaperture 4. Bulb lever has sufficient friction with the shutter toremain in its operative position until manually moved therefrom.

Thus when the lever 8 is set for time exposure upon the actuation of thetrigger I the oscillatable member will be moved'to the position shown inFig. 4 and after the required time has elapsed the aperture 4 may beclosed in either one of two ways. First, by releasing the trigger 5 thecover blind l4 will cover the aperture and the shutter blade will returnto its normal position. 0r, second, by merely moving the time lever B toits instantaneous position, the lug 38 will be moved into the notch 33so that the spring i1 will cause the oscillatable member to move untilarm is strikes shoulder 3!, thus causing the shutter lever to completeits movement to close the exposure aperture.

With a shutter of the type described, it is only necessary to move theshutter trigger 5 in one direction to make an exposure, because afterthe shutter blade has been moved through the action of the spring II tocomplete an exposure as indicated in Fig. 5, a release of the triggerwill permit the spring I! to return the trigger to its initial positionindicated in Fig. 1. As will be seen from Fig. 6, the return movement ofthe spring l1 and alter the cover blind i4 lies over the exposureaperture 4 the studs i6 and II pass a dead center, causing theoscillatable member to swing so that arm It leaves shoulder 3i and movesuntil it strikes shoulder 30, thus returning the shutter parts to theirinitial position. i

A shutter described as above utilizing hypocycloidal gearing is ofespecial advantage because I have iicient resistance to the shutterblade to prevent the blade from making too rapid a movement under theimpulse of a light spring. It is, of course, always desirable to use aslight a spring causing gear 24 to roll in gear, shutter blade may turnupon inFigs.land'ltotheposifound that such gearing oflerssufascanbeusedwithoutsaerincimsiiieiencybecauseit requires lesspressureonthesimtter trigger.

-Aithough I have described my invention in some detail, it is to beunderstood'that the. invention may be carried out in a number or ways.Hence, it is not to be restricted, excepting insotar as is necessitatedby the prior art and the spirit of the appended claims. I claim: 1. In ashutter for photographic cameras. the

combination with an apertured easing, of a shut-' ter blade adapted tocover and uncover the aperture, an oscillatable member mounted on thecasing, means to oscillate the member on its mount, a pivotal mountcarried by the oscillatable member and rotatably supporting thereon saidshutter blade and a gear iixedLy carried thereby, a gear carried by theshutter meshing with the shutter blade gear, whereby oscillation oi theoscillatable member may swing the shutter through engagement oi theshutter gear and blade gears, a trigger, and a spring connecting thetrigger and oscillatable member for operating the latter from the formerwhen the trigger is moved.

2. In a shutter for photographic cameras, the combination with anapertured casing, of a shutter blade for opening and closing theaperture,

a trigger .ior actuating the shutter, connections between the triggerand shutter blade including hypocyclic gearing for imparting compoundrotation of said blade to make an exposure, and a spring included in theconnections between the trigger and shutter blade adapted to betensioned and released through movement of the trigger for impartingmovement to the shutter blade.

3. In a photographic camera shutter, the combination with an aperturedcasing, of an oscillatable member mounted therein, and carrying anoscillatable stud, a shutter blade pivoted on the stud and comprising apairoi spaced similar leaves, ture according to the position of theshutter blade,

cooperating parts on the blade and shutter for moving the former by thelatter when said blade pivot is moved by the oscillatable member, aspring attached to the oscillatable member, and a trigger carrying theother end of said spring whereby manual operation of the trigger mayturn the shutter blade through the action of the spring to make anexposure.

4. In a photographic camera shutter, the comblnation with an aperturedcasing, including an annular flange extending around the aperture, of anoscillatable member mounted therein, and journaled upon the annularflange, and carrying an oscillatable stud, a. shutter blade pivoted onthe ,stud and comprising a pair of spaced similar leaves, each adaptedto cover the exposure aperture according to the position of the shutterblade. cooperating parts on the blade and shutter, for moving the formerby the latter when said-blade pivot is moved by the oscillatable member,a spring attached to the oscillatable member, and a trigger carryin theother end of said sprhm whereby manual operation of the trigger may turnthe shutter blade through the action of the spring to make an exposure.

each adapted to cover the exposure aper- 5. In a photographic camerashutter the comshutter blade through the ture according to the position01' the shutter blade, cooperating parts on the blade and shutter movedby the tached to the oscillatable member, and a trigger carrying theother end of said spring whereby manual operation 01' the trigger mayturn the action oi the spring a spring atthe shutter, port being carriedby said oscillatable member to move about the axis of the shutter, gearteeth carried by the shutter blade, and gear teeth carried by theshutter and meshing therewith,

other may be swung over the exposure aperture to make an exposure.

7. In a shutter for photographic cameras, the combination with anannular apertured shutter casing, of a shutter blade includingsymmetrical leaf portions, a pivotal support for the shutter bladearranged oil-center with respect to the spring connections between thetrigger and oscillatable member for rapidly moving the latter from theformer, said meshing gear teeth operating the shutter MILLER R.HU'ICHISON, Jx.

